/Engine/Source/Runtime/CoreUObject/Public/UObject/Class.h
Adds an object instance to the map of source objects to their instances. If there is already a mapping for this object, it will be replaced and the value corresponding to ObjectInstance's archetype will now point to ObjectInstance.
void AddNewInstance ( class [UObject](API\Runtime\CoreUObject\UObject\UObject) * ObjectInstance, class [UObject](API\Runtime\CoreUObject\UObject\UObject) * InArchetype )